The coherence principle (also called seductive details¹⁾ effect) claims that extraneous material that may be interesting or motivating but is irrelevant for learning objectives generally wastes learning resources and hinders learning of important material. This assumption is grounded in the fact that human cognitive resources are limited. Still, cognitive load theory predicts this effect will only occur if the cognitive load imposed by important learning material is high enough.²⁾

³⁾⁴⁾.